Penrose Diagrams of Charged and Rotating Black Holes
Part of the SpringerBriefs in Physics book series (SpringerBriefs in Physics)
As we saw, Penrose diagrams exhibit the causal structure of space-time. Penrose diagrams are found in two steps:
Choose coordinates that map boundaries of space-time to finite coordinate distance.
Conformal rescaling of metric i.e. get rid of divergent part of metric, namely, the conformal factor.
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